Prevent Standard users from seeing and mounting drivesNotice that last X on there? chmod anything as a 1 and that sets executable. You want 4 or 0 for readonly or no access. Remember this goes back to binary: RWX 000 = none; 001 = execute only; 100 = dec 4, readonly; Just remember that.

How to view all mounted devices and respective free spaceWhile there may be one, you're defeating the very purpose of using Linux/Unix. If you want it to be like Windows then why bother with Ubuntu? There's a lot of power in BASH, take the time to learn it and it will pay off immensely.

Ubuntu 11.10 crashes on boot shows busyboxDid you upgrade your computer? Is this a fresh install? What are the last things that you installed? Have you made any changes recently? We'd need more details to tell you what the real problem is. The best I can figure from this is that you've managed to delete a key system file and it's booting to recovery mode.